SAP ERP and Anaplan serve different purposes and actually work well together.   Think of SAP ERP focused on the Actuals, while Anaplan models the future. The reason why I’ve seen clients use Anaplan for planning vs. SAP BPC is Anaplan is more flexible and can easily keep up…

We use paginated reporting in Power BI to create excel style reporting with detailed control over font size etc.  The downside is you will need Power BI premium to make it available to a wide audience.  Hope this helps.

I've not come across a great integrated solution. We use Power BI, but the AI/ML is limited, so need to supplement it with AutoML in Azure ML studio for more detailed prediction models. The Azure ML workspace is free for the first year, so worth looking into. 

Tableau is a good choice, but I would also look at Power BI. We are using Power BI more because of its integrated data lake back end (dataflows) and its new integration into Power Automate.